According to Mastercraft Parts/CS, UFP only supplied a oil bath wheel bearing system to MC for approx. 1 year and UFP may have recommend 50wt oil, but since then the supplier to MC has been Reliable and you need to follow their recommendations per your owners manual, if you have a Reliable system.

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Quote: 2RLAKE,
At some point in time people need to wake up, remove their cranial intrusion into their own rectal areas, and take responsibility for their own actions.